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Re: [EnergyPlus_Support] VAV AHU with Reheat Control



You might want to look at the example file that ships with E+ called Night-Ventilation-3 there is an availability manager night ventilation, as well as a fan performance night  night ventilation, and some compact schedules that could be modified. 

Nighttime flush is a often overlooked EEM that can be very beneficial in areas with large diurnal shift, you might want to use the software called "climate consultant" to analyze your weather file, or even possibly use the epw weather tool to get your weather data to excel to analyze the patterns so that you can come up with a good control schedule.


Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions
120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951
www.phasechange.com 
  






On Wed, Oct 31, 2012 at 10:53 AM, HJ <wanghaojie630@xxxxxxxxx> wrote:
 

Thanks for your reply. I actually want to combine mechanical system with night cooling strategy. And I only want the chiller be turned on when zone temperature is larger than a certain value (26 C). And if I only set the thermostat at this temperature, I see the chiller electricity consumption is even larger than when I use mechanical system along.

HJ



On 10/31/2012 1:12 PM, YuanLu Li wrote:
 

Why do you want to control the chiller water temperture, from the zone thermostat?
 
You can use a small chiller and/or  large chiller to save energy, when the demand changes.
 
When there is no cooling demand, the chiller is cycled on and off by itself to maintain the water temperature you have specified.   (7°C   to 12.5°C in plant sizing).  You can this temperature.

The master zone theremostat configuration  controls the complressor of the air to air AHU system with DX cooling coil. 
 
If you use the zone theremostat to turn off the chlller and let the water temperature to  rise to the ODT, there may be a long delay to cool the water down again. 
 
 Dr. Li  

 
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: wanghaojie630@xxxxxxxxx
Date: Wed, 31 Oct 2012 12:14:41 -0400
Subject: [EnergyPlus_Support] VAV AHU with Reheat Control

 
Hi all,

I wonder if there is a way to control the chiller based on the zone air
temperature when I use VAV AHU with reheat system. People told me that
the the thermostat will only control the damper. The chiller is
controlled by the setpoint manager for deck temperature. If I only want
to control the chiller by zone air temperature, how can I config this
system? Or I can only do this with CAV?

Thanks,

HJ





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